Stergar Jošt, Osterman Natan
Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, Ljubljana, Slovenia.
J. Stefan Institute, Jamova 39, Ljubljana, Slovenia.
Beilstein J Nanotechnol. 2020 Jul 30;11:1126-1133. doi: 10.3762/bjnano.11.97. eCollection 2020.
We present the trapping and manipulation of a single nano-object in an aqueous medium by optically induced temporally varying temperature gradients. By real-time object tracking and control of the position of the heating laser focus, we can precisely employ thermophoretic drift to oppose the random diffusive motion. As a result, a nano-object is confined in a micrometer-sized trap. Numerical modeling gives a quantitative prediction of the effect. Traps can be dynamically created and relocated, which we demonstrate by the controlled independent manipulation of two nanoparticles.
我们展示了通过光学诱导的随时间变化的温度梯度在水介质中捕获和操纵单个纳米物体的方法。通过实时物体跟踪和加热激光焦点位置的控制，我们能够精确地利用热泳漂移来对抗随机扩散运动。结果，一个纳米物体被限制在一个微米大小的陷阱中。数值模拟对该效应给出了定量预测。陷阱可以动态创建和重新定位，我们通过对两个纳米颗粒的受控独立操纵来证明这一点。
